A scarf cloud is a specific type of cloud formation often observed above cumulus clouds. It's defined as:
a wispy cloud forming above and later mantling the sides of a rising cumulus.
In simpler terms, a scarf cloud looks like a smooth, cap-like cloud sitting on top of or partially enveloping a rising cumulus cloud.
Understanding Scarf Clouds
Here's a breakdown of what makes up a scarf cloud:
- Formation: Scarf clouds form when warm, moist air rises rapidly, often due to a rising cumulus cloud beneath.
- Appearance: They typically appear as smooth, veil-like clouds, sometimes displaying vibrant colors (iridescence).
- Association with Cumulus: They're always associated with cumulus or cumulonimbus clouds. The cumulus cloud provides the rising air needed for the scarf cloud to form.
- Scientific Name: They are officially known as pileus clouds.
Characteristics of Scarf Clouds
| Feature | Description |
|---|---|
| Appearance | Wispy, smooth, cap-like |
| Location | Above or partially covering a rising cumulus cloud |
| Formation | Rising warm, moist air |
| Official Name | Pileus cloud |
How do Scarf Clouds Form?
The formation process involves:
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Rising Cumulus Cloud: A cumulus cloud forms due to rising warm air.
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Upward Airflow: This rising air current continues above the cumulus cloud.
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Cooling and Condensation: As the warm, moist air rises further and cools, it condenses, forming a thin layer of cloud – the scarf cloud or pileus.
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Dissipation: Scarf clouds are usually short-lived. The rising cumulus cloud often merges with or breaks through the scarf cloud.
